You can actually buy that costume on eBay. Quite a few stores on there sell it.
Otherwise, just find a Miku tutorial and follow that - it's literally the same outfit.
ECCC 2015/Otakon 2015:
Monica Rambeau - Nextwave Version
Panne - Fire Emblem: Awakening
Lyn - Fire Emblem: Rekka no Ken
Palutena - Kid Icarus